What is ceratonin?

Answer 1

If you mean serotonin, it's a neurotransmitter, a chemical that carries signals between cells in the body. There's lots of specific information about serotonin at the Wikipedia link below.

Answer 2

There is no known substance or chemical by the name "ceratonin." It may be a misspelling or a misunderstanding of another term. If you have more context or information, I can try to provide a more accurate answer.